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Investments in Equity Securities (Investment in Cronos Narrative) (Details) - Cronos [Member] $ / shares in Units, shares in Thousands, $ in Millions, $ in Billions		6 Months Ended	12 Months Ended
	Jul. 26, 2021 USD ($)	Jun. 30, 2021 CAD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) shares	Jun. 30, 2021 $ / shares
Investments [Line Items]
Ownership percentage			43.50%	42.10%
Number of ordinary shares owned (approximately) (in shares) | shares				156,600
Equity method investments			$ 1,173	$ 1,041
Equity method investment, difference between carrying amount and fair value, percentage (approximately)		55.00%	8.00%
Equity Contract, Preemptive Rights [Member]
Investments [Line Items]
Equity method investment, shares purchased, (CAD per share) | $ / shares					$ 16.25
Equity method investment, number of shares eligible for purchase (approximately) (in shares) | shares				14,000
Equity method investment, aggregate exercise price		$ 0.2
Equity Contract, Preemptive Rights [Member] | Subsequent Event [Member]
Investments [Line Items]
Equity method investment, aggregate exercise price	$ 200
Equity Contract, Warrant [Member]
Investments [Line Items]
Equity method investment, shares purchased, (CAD per share) | $ / shares					$ 19.00
Equity method investment, number of shares eligible for purchase (approximately) (in shares) | shares				83,000
Equity method investment, percentage of shares eligible for purchase (approximately)				10.00%
Equity method investment, aggregate exercise price		$ 1.6
Equity Contract, Warrant [Member] | Subsequent Event [Member]
Investments [Line Items]
Equity method investment, aggregate exercise price	$ 1,300
Equity Contract, Warrant And Equity Contract, Preemptive Rights [Member]
Investments [Line Items]
Equity method investment, warrant exercised, ownership percentage		53.00%
Common Stock [Member]
Investments [Line Items]
Equity method investments			$ 1,010	$ 871
Fair Value, Inputs, Level 1 [Member]
Investments [Line Items]
Fair value of equity investment			$ 1,100	$ 1,300

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